US6683792B2 - Housing structure for ultrafast communication apparatus - Google Patents

Housing structure for ultrafast communication apparatus Download PDF

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Publication number
US6683792B2
US6683792B2 US10/294,151 US29415102A US6683792B2 US 6683792 B2 US6683792 B2 US 6683792B2 US 29415102 A US29415102 A US 29415102A US 6683792 B2 US6683792 B2 US 6683792B2
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United States
Prior art keywords
plug
shelf
unit
guide plate
communication apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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US10/294,151
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English (en)
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US20030214798A1 (en
Inventor
Takashi Shirakami
Naoya Yamazaki
Kazuhiro Iino
Yoshiaki Tada
Hiroshi Katagiri
Yoshinori Hoshino
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Fujitsu Ltd
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Fujitsu Ltd
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Assigned to FUJITSU LIMITED reassignment FUJITSU LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HOSHINO, YOSHINORI, IINO, KAZUHIRO, KATAGIRI, HIROSHI, SHIRAKAMI, TAKASHI, TADA, YOSHIAKI, YAMAZAKI, NAOYA
Publication of US20030214798A1 publication Critical patent/US20030214798A1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20536—Modifications to facilitate cooling, ventilating, or heating for racks or cabinets of standardised dimensions, e.g. electronic racks for aircraft or telecommunication equipment
    • H05K7/20554—Forced ventilation of a gaseous coolant
    • H05K7/20563—Forced ventilation of a gaseous coolant within sub-racks for removing heat from electronic boards
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/02—Constructional details
    • H04Q1/021—Constructional details using pivoting mechanisms for accessing the interior of the apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/02—Constructional details
    • H04Q1/035—Cooling of active equipments, e.g. air ducts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/02—Constructional details
    • H04Q1/11—Protection against environment
    • H04Q1/116—Protection against environment lightning or EMI protection, e.g. shielding or grounding
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/14—Mounting supporting structure in casing or on frame or rack
    • H05K7/1401—Mounting supporting structure in casing or on frame or rack comprising clamping or extracting means
    • H05K7/1402—Mounting supporting structure in casing or on frame or rack comprising clamping or extracting means for securing or extracting printed circuit boards
    • H05K7/1409—Mounting supporting structure in casing or on frame or rack comprising clamping or extracting means for securing or extracting printed circuit boards by lever-type mechanisms
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0062—Structures of standardised dimensions, e.g. 19" rack, chassis for servers or telecommunications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2201/00—Constructional details of selecting arrangements
    • H04Q2201/10—Housing details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2201/00—Constructional details of selecting arrangements
    • H04Q2201/12—Printed circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2201/00—Constructional details of selecting arrangements
    • H04Q2201/14—Screening, grounding or crosstalk reduction details

Definitions

  • the present invention relates generally to a communication apparatus, and more particularly to a housing structure for an ultrafast communication apparatus.
  • a communication apparatus such as a transmission device and a switching device is configured by vertically mounting a plurality of plug-in units (PIU) to a back wiring board mounted in a shelf.
  • POU plug-in units
  • Each plug-in unit is provided by an electronic circuit package. That is, each plug-in unit includes a printed wiring board and a plurality of electronic components such as LSIs having electronic circuits mounted on the printed wiring board.
  • each plug-in unit In high-speed transmission, it is necessary to ensure a capability of resisting EMI.
  • each plug-in unit As conventional countermeasures against EMI, each plug-in unit is constructed of a box-shaped structure to thereby realize an electromagnetically sealed structure.
  • countermeasures against EMI have disadvantages that the structure of each plug-in unit is complicated and that a cost increase is invited.
  • all opening portions of the communication apparatus are not managed by a cutoff frequency, and it is hard to cope with high-frequency EMI at present.
  • the gasket exerts an elastic force in the lateral direction of each plug-in unit, causing a hindrance to smooth insertion/ejection of each plug-in unit with respect to the shelf.
  • Such a conventional communication apparatus employs a punching metal as a shield board for ensuring EMI resistance and fire resistance.
  • the punching metal has a low opening ratio, so that the air-flow resistance of cooling air for the communication apparatus is high, causing a bottleneck in improving the cooling performance.
  • the thickness of the punching metal must be increased to satisfy the cutoff frequency, causing an increase in weight.
  • a conventional lever for use in plug-in connection of the connectors of each plug-in unit and the back wiring board is limited in its engagement accuracy. In particular, a connector with a short engagement length under development for ultrahigh frequencies cannot ensure a sufficient connection reliability. Accordingly, any additional fixing means such as a screw must be provided to sufficiently engage the connectors by the use of the conventional lever.
  • a communication apparatus increasing a shelf formed of metal, the shelf having a pair of side plates; a back wiring board mounted in the shelf on the back side thereof, the back wiring board having a plurality of first connectors and a solid ground pattern; an upper guide plate mounted in the shelf on the upper side thereof, the upper guide plate having a plurality of guide rails and a plurality of vent holes; a first shield board mounted on the upper guide plate, the first shield board having numerous openings; a lower guide plate mounted in the shelf on the lower side thereof, the lower guide plate having a plurality of guide rails and a plurality of vent holes; a second shield board mounted on the lower guide plate, the second shield board having numerous openings; a plurality of plug-in units mounted in the shelf so as to be inserted along the guide rails of the upper guide plate and the guide rails of the lower guide plate, each of the plug-in units having a printed wiring board, a second connector mounted on the printed wiring board and connected to one of
  • the communication apparatus further includes an external cable inserted in the front structure of each plug-in unit; the front structure of each plug-in unit having a shielded external cable introducing portion for introducing the external cable to the printed wiring board.
  • the communication apparatus further increases an upper strike plate mounted on the front side of the upper guide plate; and a lower strike plate mounted on the front side of the lower guide plate.
  • the upper surface of the front structure of each plug-in unit has a first projection; the lower surface of the front structure of each plug-in unit has a second projection; the upper strike plate has a plurality of recesses for respectively engaging the first projections of the plug-in units; and the lower strike plate has a plurality of recesses for respectively engaging the second projections of the plug-in units.
  • the recesses of the upper strike plate increase a plurality of guide rails respectively aligned with the guide rails of the upper guide plate; and said recesses of the lower strike plate increase a plurality of guide rails respectively aligned with the guide rails of the lower guide plate.
  • the upper surface of the front structure of each plug-in unit may have a first recess; the lower surface of the front structure of each plug-in unit may have a second recess; the upper strike plate may have a plurality of projections for respectively engaging the first recesses of the plug-in units; and the lower strike plate may have a plurality of projections for respectively engaging the second recesses of the plug-in units.
  • the plug-in units vertically mounted in the shelf are fixed by the engagement of the first connectors of the back wiring board and the second connectors of the plug-in units on the back side of the shelf and by the engagement of the projections or recesses of the plug-in units and the recesses or projections of the upper and lower strike plates on the front side of the shelf. Accordingly, although the gaskets of the adjacent plug-in units exert elastic forces in the lateral direction, the elastic forces can be absorbed to some extent by the engagement of the projections and the recesses on the front side of the shelf, so that the insertion/ejection of the plug-in units are not hindered by the elastic forces.
  • each of the first and second shield boards increases a honeycomb shield board having numerous honeycomb-shaped openings.
  • the front structure of each plug-in unit has a pair of upper and lower levers pivotably mounted at upper and lower end portions, each of the levers having a first engaging portion and a second engaging portion; the upper strike plate having a groove for engaging the first engaging portion of the upper lever; the lower strike plate having a groove for engaging the first engaging portion of the lower lever.
  • the upper guide plate has a plurality of first elastic lock members respectively corresponding to the plug-in units and biased downward; the lower guide plate has a plurality of second elastic lock members respectively corresponding to the plug-in units and biased upward; and the printed wiring board of each plug-in unit has a first notch for engaging the corresponding first elastic lock member and a second notch for engaging the corresponding second elastic lock member.
  • the front structure of each plug-in unit has a first unlocking mechanism for disengaging the corresponding first elastic lock member from the first notch, and a second unlocking mechanism for disengaging the corresponding second elastic lock member from the second notch.
  • FIG. 1 is a perspective view of a preferred embodiment of the present invention
  • FIG. 2 is a sectional side view of the preferred embodiment
  • FIG. 3 is a plan view of an upper guide plate
  • FIG. 4 is an elevational view of FIG. 3;
  • FIG. 5 is a right side view of FIG. 3;
  • FIG. 6A is a plan view of an upper strike plate
  • FIG. 6B is an elevational view of FIG. 6A
  • FIG. 7 is a perspective view of a plug-in unit
  • FIG. 8 is a partially transparent, side view of the plug-in unit
  • FIG. 9 is a transparent elevational view of the plug-in unit
  • FIG. 10 is an enlarged elevational view showing the engagement of projections of the plug-in units and recesses of the upper strike plate
  • FIG. 11 is a plan view of FIG. 10;
  • FIG. 12 is a right side view of FIG. 10;
  • FIG. 13 is an enlarged elevational view showing the engagement of recesses of the plug-in units and projections of the upper strike plate as a modification
  • FIG. 14 is a perspective view of a honeycomb shield board
  • FIG. 15 is a perspective view of the honeycomb shield board mounted on the upper guide plate
  • FIG. 16A is a cross section taken along the line 16 A— 16 A in FIG. 15;
  • FIG. 16B is a cross section taken along the line 16 B— 6 B in FIG. 15;
  • FIG. 17 is an elevational view of a back wiring board
  • FIG. 18 is a cross section taken along the line 18 — 18 in FIG. 17;
  • FIG. 19 is a perspective view of another shield board usable in the present invention.
  • FIG. 20A is an enlarged view of a part of the shield board shown in FIG. 19 in its uncompressed condition
  • FIG. 20B is a view similar to FIG. 20A, showing a compressed condition
  • FIG. 21 is a plan view showing a gasket mounting portion of a shelf in the preferred embodiment
  • FIG. 22 is an enlarged view of an encircled portion P shown in FIG. 21;
  • FIG. 23A is an exploded perspective view of a gasket and a bracket for mounting the gasket to the shelf;
  • FIG. 23B is a perspective view showing a condition where the gasket is mounted on the bracket
  • FIG. 24 is a sectional side view of the upper strike plate and each plug-in unit engaged therewith;
  • FIG. 25 is an enlarged sectional view showing the relation between the upper strike plate and a gasket mounted on each plug-in unit;
  • FIG. 26 is a partially cutaway, perspective view of each plug-in unit as viewed from the front side thereof;
  • FIG. 27 is a partially cutaway, perspective view of each plug-in unit as viewed from the back side thereof;
  • FIG. 28 is a side view of an insertion/ejection mechanism for each plug-in unit
  • FIG. 29 is a bottom plan view of FIG. 28;
  • FIGS. 30A to 31 B are side views for illustrating the operation of inserting each plug-in unit into the shelf
  • FIGS. 32A to 33 B are side views for illustrating the operation of ejecting each plug-in unit from the shelf;
  • FIG. 34A is a schematic elevation showing a normally fixed condition of the honeycomb shield board to the shelf.
  • FIG. 34B is a view similar to FIG. 34A, showing a condition where the honeycomb shield board is bent.
  • FIG. 1 is a partially cutaway, perspective view of a communication apparatus 2 such as a transmission device according to a preferred embodiment of the present invention
  • FIG. 2 is a sectional side view of the communication apparatus 2
  • the communication apparatus 2 includes a shelf 4 formed of metal and a plurality of plug-in units (PIU) 38 vertically mounted in the shelf 4 .
  • the plug-in units 38 are not shown.
  • the shelf 4 has a pair of side plates 4 a , a bottom plate 4 b , a fan supporting plate 4 c , a top plate 4 d inclined so as to be raised on the back side, and a back plate 4 e.
  • a back wiring board (BWB) 6 having a plurality of connectors 8 is mounted in the shelf 4 on the back side thereof.
  • Reference numeral 10 denotes an upper guide plate, and the details thereof are shown in FIGS. 3 to 5 .
  • the upper guide plate 10 has a plurality of guide rails 12 and a plurality of vent holes 14 .
  • the upper guide plate 10 is provided at its front end with a strike plate mounting portion 10 a.
  • a strike plate 18 is fixed to the strike plate mounting portion 10 a of the upper guide plate 10 on the lower side thereof by screws. As shown in FIGS. 6A and 6B, the strike plate 18 has a groove 20 for engaging a lever of each plug-in unit 38 for use in inserting and ejecting the plug-in unit 38 to be hereinafter described in detail, and a plurality of guide rails 22 respectively aligned with the guide rails 12 of the upper guide plate 10 .
  • a shield board 16 having numerous openings is mounted on the upper surface of the upper guide plate 10 . The shield board 16 is provided by a honeycomb shield board having numerous honeycomb-shaped openings as will be hereinafter described in detail.
  • Reference numeral 24 denotes a lower guide plate. Like the upper guide plate 10 , the lower guide plate 24 has a plurality of guide rails 26 and a plurality of vent holes 28 . A honeycomb shield board 30 having numerous honeycomb-shaped openings is fixed to the lower surface of the lower guide plate 24 .
  • a strike plate 32 is mounted on a front end portion of the lower guide plate 24 .
  • the strike plate 32 has a groove 34 for engaging another lever of each plug in unit 38 for use in inserting and ejecting the plug-in unit 38 , and a plurality of recesses 36 for allowing the pass of external cables to be hereinafter described.
  • the strike plate 32 further has a plurality of guide rails (not shown) respectively aligned with the guide rails 26 of the lower guide plate 24 .
  • each plug-in unit 38 has a printed wiring board 40 on which a plurality of electronic components (not shown) are mounted, a plurality of connectors 42 adapted to be connected to the connectors 8 of the back wiring board 6 , and a front structure 44 fixed to the front end of the printed wiring board 40 .
  • a conductive gasket 46 is continuously mounted on the upper surface, one of the opposite side surfaces, and the lower surface of the front structure 44 .
  • Projections 48 and 50 are provided on the upper and lower surfaces of the front structure 44 , respectively.
  • Levers 52 and 54 for insertion/ejection of the plug-in unit 38 are pivotably mounted through shafts 53 and 55 to the upper and lower end portions of the front structure 44 , respectively.
  • the shaft 55 is shown in FIG. 28 .
  • a plurality of external cables (optical fiber cables) 56 are stored in the front structure 44 .
  • the external cables 56 are introduced through a shielded external cable introducing portion 58 to component mounted regions of the printed wiring board 40 .
  • the external cable introducing portion 58 is managed by a high-cutoff frequency fc (Hz) shown below.
  • d is the diameter (mm) of an opening.
  • a lower fan 60 is mounted on the bottom plate 4 b of the shelf 4
  • an upper fan 62 is mounted on the fan supporting plate 4 c of the shelf 4 .
  • the communication apparatus 2 in this preferred embodiment adopts a push-pull cooling system using the fans 60 and 62 respectively mounted in the lower and upper end portions of the shelf 4 .
  • An air chamber 64 is provided above the fan 60
  • a cable duct 66 for accommodating the external cables 56 extending from the plug-in units 38 vertically mounted in the shelf 4 is provided below the strike plate 32 .
  • FIG. 10 is an elevational view showing a condition where the projection 48 of each plug-in unit 38 is engaged with the corresponding recess 22 of the upper strike plate 18 .
  • FIG. 11 is a plan view of FIG. 10, and
  • FIG. 12 is a right side view of FIG. 10 .
  • the guide rails 22 of the upper strike plate 18 function as the recesses for engaging the projections 48 of the plug-in units 38 .
  • the guide rails of the lower strike plate 32 function as the recesses for engaging the projections 50 of the plug-in units 38 .
  • Reference numeral 68 denotes a conductive gasket mounted on one of the side plates 4 a of the shelf 4 .
  • the conductive gasket 68 is positioned so as to come into close contact with the side surface of the front structure 44 of the plug-in unit 38 on which the conductive gasket 46 is not mounted. Accordingly, in the fully inserted condition of the plug-in units 38 in the shelf 4 as shown in FIGS.
  • the gasket 68 mounted on the left side plate 4 a of the shelf 4 is in close contact with the left side surface of the front structure 44 of the first plug-in unit 38 adjacent to the left side plate 4 a
  • the gasket 46 mounted on the right side surface of the front structure 44 of the first plug-in unit 38 is in close contact with the left side surface of the front structure 44 of the second plug-in unit 38 adjacent to the first plug-in unit 38
  • the other adjacent plug-in units 38 are close contact with each other through the gaskets 46 .
  • the gaskets 68 and 46 exert lateral elastic forces to possibly cause the lateral shift of the front structure 44 of each plug-in unit 38 .
  • each plug-in unit 38 can be smoothly inserted and ejected.
  • Each plug-in unit 38 is positioned on the back side of the shelf 4 by the engagement of the connectors 42 with the connectors 8 of the back wiring board 6 , and is further positioned on the front side of the shelf 4 by the engagement of the projection 48 with the corresponding recess 22 of the upper strike plate 18 and by the engagement of the projection 50 with the corresponding recess of the lower strike plate 32 .
  • FIG. 13 shows a modification of the configuration shown in FIG. 10 .
  • the upper surface of the front structure 44 of each plug-in unit 38 is formed with a recess 70
  • the upper strike plate 18 is formed with a projection 72 adapted to engage the recess 70
  • the lower surface of the front surface 44 of each plug-in unit 38 is formed with a recess
  • the lower strike plate 32 is formed with a projection adapted to engage this recess of each plug-in unit 38 .
  • FIG. 14 is a perspective view of the honeycomb shield board 16 .
  • the honeycomb shield board 16 is formed of aluminum, for example, and it is manufactured by a conventional aluminum honeycomb manufacturing process. More specifically, this process includes the steps of stacking a plurality of aluminum foils washed and surface-treated, and selectively applying a pressure to a portion to be bonded as heating at a high temperature, thereby bonding the stacked aluminum foils at the selected portion by diffusion bonding of metals to form a block.
  • This block is next cut into slices each having a width of about 6 mm, and each slice is expanded to manufacture the honeycomb shield board 16 .
  • the honeycomb shield board 16 has numerous openings each having a diameter of about 3 to 4 mm, and the thickness of the shield board 16 is about 6 mm.
  • the honeycomb shield board 16 is managed by the cutoff frequency fc specified by Eq. (1). According to the honeycomb shield board 16 , a high frequency of 40 GHz can be attenuated by 20 dB.
  • FIG. 15 is a perspective view of the honeycomb shield board 16 mounted on the upper guide plate 10 .
  • FIG. 16A is a cross section taken along the line 16 A— 16 A in FIG. 15, and
  • FIG. 16B is a cross section taken along the line 16 B— 16 B in FIG. 15 .
  • a metal mesh 80 is bonded to the upper guide plate 10 , and the honeycomb shield board 16 is placed on the metal mesh 80 .
  • the metal mesh 80 is provided to prevent the honeycomb shield board 16 from falling from the upper guide plate 10 .
  • Brackets 76 are mounted on the honeycomb shield board 16 along its four sides, and brackets 78 are fastened by screws 82 to the upper guide plate 10 so as to press down the brackets 76 , thus fixedly mounting the honeycomb shield board 16 to the upper guide plate 10 .
  • FIG. 18 is a cross section taken along the line 18 — 18 in FIG. 17 .
  • the back wiring board 6 has a plurality of inner-layer patterns 86 and a pair of front and rear ground patterns 84 each formed from a solid copper foil. That is, copper foils are present over the front and rear sides of the back wiring board 6 .
  • Each ground pattern 84 is covered with a resist 88 except a hatched portion 90 shown in FIG. 17 . That is, each ground pattern 84 is exposed at the hatched portion 90 and plated with a solder.
  • Reference numerals 92 denote through holes for insertion of press-fit pins 8 a . As shown in FIG. 18, the press-fit pins 8 a are inserted through the through holes 92 to thereby mount the connectors 8 on the back wiring board 6 .
  • the back wiring board 6 is fixed to the side plates 4 a of the shelf 4 by means of brackets 94 .
  • the ground patterns 84 of the back wiring board 6 are connected to a frame ground (FG).
  • the back wiring board 6 is fixed at its right and left solder plating portions 90 to the side plates 4 a of the shelf 4 , and the upper and lower solder plating patterns 90 are in contact with the upper and lower guide plates 10 and 24 , respectively, thereby connecting the shelf 4 and the upper and lower guide plates 10 and 24 to the frame ground.
  • electromagnetic shield on the upper and lower sides of the shelf 4 is realized by the upper and lower shield boards 16 and 30 connected to the frame ground
  • electromagnetic shield on the back side of the shelf 4 is realized by the ground patterns 84 of the back wiring board 6
  • electromagnetic shield on the right and left sides of the shelf 4 is realized by the right and left side plates 4 a connected to the frame ground
  • electromagnetic shield on the front side of the shelf 4 is realized by the close contact of the gasket 68 mounted on one of the side plates 4 a and the front structure 44 of one of the plug-in units 38 and by the close contact of the gasket 46 mounted on each plug-in unit 38 and the front structure 44 of the plug-in unit 38 adjacent thereto or another side plate 4 a . Accordingly, the inside of the shelf 4 is magnetically completely sealed.
  • FIG. 19 is a schematic view of another shield board 95 adoptable in the communication apparatus of the present invention.
  • the shield board 95 includes a pair of punching metals 96 and 98 and a plurality of elastic members 100 such as coil springs interposed between the punching metals 96 and 98 .
  • the punching metals 96 and 98 are bonded to the elastic members 10 by brazing or diffusion bonding.
  • FIG. 20A shows an uncompressed condition of the shield board 95
  • FIG. 20B shows a compressed condition of the shield board 95 .
  • the shield board 95 can be fixed to the shelf 4 by utilizing the resilience of the elastic members 100 , thereby eliminating the need for any mechanical fixing means such as screws.
  • the shield board 95 in its compressed condition shown in FIG. 20B is managed by the cutoff frequency fc specified by Eq. (1).
  • FIG. 21 is a schematic plan view showing a gasket mounting portion of the shelf 4 .
  • FIG. 22 is an enlarged view of an encircled portion P shown in FIG. 21 .
  • FIG. 23A is an exploded perspective view of the gasket 68 and a gasket mounting bracket 102
  • FIG. 23B is a perspective view showing a condition where the gasket 68 is mounted on the bracket 102 .
  • the gasket 68 has a plurality of projections 68 a
  • the bracket 102 has a plurality of holes 102 a respectively engaging with the projections 68 a of the gasket 68 .
  • the bracket 102 is fixed to the left side plate 4 a of the shelf 4 by means of screws.
  • FIG. 24 there is shown a sectional side view of the upper strike plate 18 and each plug-in unit 38 engaged therewith.
  • FIG. 25 is a sectional view showing the relation between the upper strike plate 18 and the gasket 46 mounted on each plug-in unit 38 .
  • a first engaging portion 52 a of the lever 52 of each plug-in unit 38 is engaged with the front wall surface of the groove 20 of the strike plate 18 , and the gasket 46 is in close contact with the lower surface of the strike plate 18 to achieve electromagnetic shield.
  • a second engaging portion 52 b of the lever 52 is used in ejecting the plug-in unit 38 .
  • the groove 20 of the strike plate 18 is defined by a pair of edge portions 104 and 106 .
  • the edge portions 104 and 106 are rounded to thereby reduce the stress on the gasket 46 in inserting and ejecting the plug-in unit 38 .
  • Each guide rail 12 of the upper guide plate 10 and each guide rail 22 of the upper strike plate 18 are higher in level than the contact surface between each gasket 46 and the upper strike plate 18 .
  • each guide rail of the lower guide plate 24 and each guide rail of the lower strike plate 32 are lower in level than the contact surface between each gasket 46 and the lower strike plate 32 . Accordingly, the vertical size of the printed wiring board 40 of each plug-in unit 38 can be enlarged to thereby increase a mount area on the printed wiring board 40 .
  • each plug-in unit 38 can be easily inserted into the shelf 4 although the vertical size of the printed wiring board 40 is larger than the distance between the contact surface of the gasket 46 and the upper strike plate 18 and the contact surface of the gasket 46 and the lower strike plate 32 .
  • FIG. 26 is a partially cutaway, perspective view of each plug-in unit 38 as viewed from the front side thereof
  • FIG. 27 is a partially cutaway, perspective view of each plug-in unit 38 as viewed from the back side thereof.
  • the levers 52 and 54 for use in inserting and ejecting the plug-in unit 38 are pivotably mounted at the upper and lower end portions of the front structure 44 of the plug-in unit 38 , respectively.
  • a pair of arms 114 are also pivotably mounted on the front structure 44 at its upper and lower end portions.
  • FIG. 28 there is shown a side view of an insertion/ejection mechanism for each plug-in unit 38 .
  • FIG. 29 is a bottom plan view of FIG. 28 .
  • a first engaging portion 54 a of the lever 54 of each plug-in unit 38 is engaged with the front wall surface of the groove 34 of the strike plate 32 .
  • a second engaging portion 54 b of the lever 54 is used in ejecting the plug-in unit 38 .
  • a plurality of elastic lock members 116 upward biased are mounted on the lower guide plate 24 .
  • a plurality of elastic lock members downward biased are mounted on the upper guide plate 10 .
  • the printed wiring board 40 of each plug-in unit 38 is formed at its lower end with a notch 118 for engaging each elastic lock member 116 .
  • a similar notch for engaging each elastic lock member mounted on the upper guide plate 10 is formed at the upper end of the printed wiring board 40 of each plug-in unit 38 .
  • the lever 54 and a rotary member 112 are pivotably mounted on the shaft 55 in the condition where a given angle is maintained between the lever 54 and the rotary member 112 .
  • the lower arm 114 is pivotably mounted on a shaft 115 .
  • the upper arm 114 is also pivotably mounted on a shaft (not shown).
  • the printed wiring board 40 of each plug-in unit 38 is guided by the corresponding guide rail 26 of the lower guide plate 24 .
  • FIGS. 30A to 31 B The operation of inserting each plug-in unit 38 into the shelf 4 will now be described with reference to FIGS. 30A to 31 B.
  • the elastic lock member 116 is depressed in the direction of arrow B by the printed wiring board 40 inserted in the direction of arrow A.
  • the lever 54 is next rotated about the shaft 55 in the direction of arrow C.
  • the rotary member 112 is also rotated about the shaft 55 together with the lever 54
  • the arm 114 engaged with the rotary member 112 is also rotated about the shaft 115 .
  • the arm 114 does not function in the inserting operation of each plug-in unit 38 .
  • FIG. 31B shows such a fully inserted condition of each plug-in unit 38 .
  • the printed wiring board 40 is completely locked by the elastic lock member 116 in such a manner that the head portion 116 a of the elastic lock member 116 is engaged with the notch 118 of the printed wiring board 40 with the upward biasing force of the elastic lock member 116 kept applied to the printed wiring board 40 .
  • the plug-in unit 38 is prevented from being pulled to the front side with almost no play. Accordingly, it is possible to ensure a high reliability of connection between the connectors 42 of the plug-in unit 38 and the connectors 8 of the back wiring board 6 .
  • each plug-in unit 38 is started by rotating the lever 54 in the direction of arrow E as shown in FIG. 32 A.
  • the lever 54 is further rotated as shown in FIG. 32B, the second engaging portion 54 b of the lever 54 comes into engagement with the front end surface of the strike plate 32 , thereby obtaining a large ejection force to pull the printed wiring board 40 in the direction of arrow F.
  • the rotary member 112 is also rotated together with the lever 54 to push up the left end portion of the arm 114 .
  • the right end portion of the arm 114 engaging with the head portion 116 a of the elastic lock member 116 pushes down the head portion 116 a in the direction of arrow G, so that the head portion 116 a comes into disengagement from the notch 118 to thereby unlock the printed wiring board 40 .
  • the lever 54 is further rotated in the direction of arrow E as shown in FIG. 33A to pull the printed wiring board 40 in the direction of arrow F.
  • the head portion 116 a of the elastic lock member 116 is depressed by an inclined edge portion 118 a of the notch 118 until the head portion 116 a reaches the lower end of the printed wiring board 40 as shown in FIG. 33 B.
  • the lever 54 is fully rotated as shown in FIG. 33 B and then pulled leftward as viewed in FIG. 33B to thereby complete the ejection of the plug-in unit 38 .
  • FIG. 34A is a schematic elevation showing a normally fixed condition of the honeycomb shield board 16 to the shelf 4
  • FIG. 34B is a view similar to FIG. 34A, showing a condition where the honeycomb shield board 16 is bent.
  • a straight flow of cooling air is obtained by the straightening operation of the honeycomb shield board 16 .
  • FIG. 34B where the honeycomb shield board 16 is bent, the numerous openings of the honeycomb shield board 16 are deflected and the direction of the cooling air flow passing through the honeycomb shield board 16 is therefore deflected.
  • the direction of the cooling air flow can be adjusted.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mounting Of Printed Circuit Boards And The Like (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
US10/294,151 2002-05-14 2002-11-14 Housing structure for ultrafast communication apparatus Expired - Fee Related US6683792B2 (en)

Applications Claiming Priority (2)

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JP2002-139122 2002-05-14
JP2002139122A JP2003332777A (ja) 2002-05-14 2002-05-14 通信装置

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US6683792B2 true US6683792B2 (en) 2004-01-27

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Cited By (4)

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US20050168964A1 (en) * 2002-07-08 2005-08-04 Roland Plabst Electrically shielded module carrier
US20050281013A1 (en) * 2004-06-21 2005-12-22 Carullo Thomas J Removable ribs in a chassis housing to accommodate extra-wide printed circuit board assemblies
US7215536B2 (en) * 2002-12-23 2007-05-08 Hewlett-Packard Development Company, L.P. Electromagnetic shield assembly
US20080042019A1 (en) * 2006-08-04 2008-02-21 Prime View International Co., Ltd. Glass substrate carrier assembly

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CN2636593Y (zh) * 2003-06-21 2004-08-25 鸿富锦精密工业（深圳）有限公司 插件安装结构
US8141723B2 (en) * 2006-08-18 2012-03-27 Plano Molding Company Inverted cell honeycomb structure shelving
US7504591B2 (en) * 2007-01-23 2009-03-17 Uber Co., Ltd. Electromagnetic shielding gasket and electronic device provided therewith
CN104470312B (zh) * 2014-12-25 2017-08-01 烽火通信科技股份有限公司 一种兼顾走线功能的进风装置
US10709238B1 (en) * 2015-07-24 2020-07-14 Richard Simon Thompson Shelf system improvements

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Publication number Publication date
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JP2003332777A (ja) 2003-11-21

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